He was born on 8 April 1788 in Exeter the son of Admiral Sampson Michell (1755–1809) and his wife Anne Shears (1755–1838).
In 1805 in the latter he helped to capture the 6 gun Spanish privateer "Mestuo le Solidad" under Captain William Hoste.
During this period in 1809, his father died in Rio de Janeiro and Frederick inherited his grandfather's estate.
In the latter in 1816 he served at the Siege of Algiers and led the battering flotilla under Admiral Edward Pellew, 1st Viscount Exmouth.
[citation needed] In May 1826 he married another 16 year old, Caroline Frances Prideaux (1810–1856) at St Clement Danes in Westminster, London.
In the 1861 census (at North Gate in Totnes) he was living with two teenage sisters, Louisa (18) and Emily Fyson (16) of Brighton who are described as his "Wards in chancery".
[citation needed] His sister, Emma Carolina Michell, married Rev Sir John Stuart Page Wood.